On Thu, 10 May 2018 05:35:56 +0900,
TJ OConnor wrote:
>
> [1 <text/plain; utf-8 (quoted-printable)>]
> Sir,
>
> Thank you for the response. I am writing packets exactly like this and it is
> still truncating packets that are > 62 bytes.
>
>
> class SimpleSwitch13(app_manager.RyuApp):
> OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
> def __init__(self, *args, **kwargs):
> super(SimpleSwitch13, self).__init__(*args, **kwargs)
> self.mac_to_port = {}
> # Create pcaplib.Writer instance with a file object
> # for the PCAP file
> self.pcap_writer = pcaplib.Writer(open('mypcap.pcap', 'wb'))
> ...
> @set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
> def _packet_in_handler(self, ev):
> # Dump the packet data into PCAP file
> self.pcap_writer.write_pkt(ev.msg.data)
ryu.lib.pcaplib.Writer's default snaplen is 65535, so it's more likely
the packets are truncated on arrival of packet-ins.
Please check 7.4.1 Packet-In Message of the OpenFlow spec 1.3.5 and
referenced sections for details.
>
> > On May 3, 2018, at 1:20 AM, TJ OConnor <[email protected]> wrote:
> >
> > Hello,
> >
> > I have an issue where RYU pcaplib.Writer() isn’t writing full packets.
> >
> > Ive created a RYU PCAP Writer Object as described here.
> > https://github.com/osrg/ryu/blob/master/ryu/lib/pcaplib.py
> > <https://github.com/osrg/ryu/blob/master/ryu/lib/pcaplib.py>
> > self.pcap_writer = pcaplib.Writer(open('mypcap.pcap', 'wb’))
> >
> > However, when I tcpdump the resulting pcap, it shows that the packets are
> > all truncated at 62 bytes.
> > I’ve adjusted the snaplen=4294967295 and the issue is still the same.
> >
> > Any suggestions would be greatly appreciated.
> >
> > tcpdump -r mypcap.pcap …
> >
> > 23:05:39.948667 IP truncated-ip - 1 bytes missing! ubuntu.65277 >
> > amazonaws.com.https: Flags [P.], seq 317:380, ack 253, win 4096, options
> > [nop,nop,TS val 800045157 ecr 739067198], length 63
> > 23:05:39.995833 IP truncated-ip - 1 bytes missing! amazonaws.com.https >
> > ubuntu.65277: Flags [P.], seq 253:316, ack 380, win 1136, options
> > [nop,nop,TS val 739069697 ecr 800045157], length 63
> >
> >
> >
> >
> >
>
> [2 <text/html; utf-8 (quoted-printable)>]
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